Journal
INTERNATIONAL JOURNAL OF NANOMEDICINE
Volume 16, Issue -, Pages 7051-7069Publisher
DOVE MEDICAL PRESS LTD
DOI: 10.2147/IJN.S332830
Keywords
human serum albumin; HSA; multidrug resistance; MDR; co-delivery carrier; small interfere RNA; gene silencing
Funding
- National Natural Science Foundation [81502688]
- Beijing Natural Science Foundation Program
- Scientific Research Key Program of Beijing Municipal Commission of Education [KM201810025019]
- Capital Medical University [16JL72, 17JL67]
- Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions (2013-2015)
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The study demonstrated that HSA-based C-H/D/M nanoparticles effectively released and internalized doxorubicin, downregulated MDR1 mRNA and P-gp expression in breast cancer cell lines. Animal experiments showed that C-H/D/M targeted delivery of siMDR1 and doxorubicin to tumor tissues and inhibited tumor growth without significant damage to major organs.
Background: Breast cancer is the most prevalent cancer among women. Doxorubicin (DOX) is a common chemotherapeutic drug used to treat many different cancers. However, multidrug resistance limits the treatment of breast cancer. MDR1 siRNA (siMDR1) combinatorial therapy has attracted significant attention as a breakthrough therapy for multidrug resistance in tumors. However, naked siRNA is easily degraded by enzymatic hydrolysis requiring an siRNA carrier for its protection. Human serum albumin (HSA) was selected as the carrier due to its excellent biocompatibility, non-toxicity, and non-immunogenicity. Cetuximab was used to modify the HSA nanoparticles in order to target the tumor tissues. Methods: This study used a central composite design response surface methodology (CCDRSM) to investigate the optimal formula for HSA NPs preparation. Cex-HSA/DOX/MDR1 siRNA (C-H/D/M) was characterized by dynamic light scattering and transmission electron microscopy. The efficacy of C-H/D/M tumor growth inhibitory activity was investigated in vitro and in vivo using confocal imaging, MTT assay, and an MCF-7/ADR tumor-bearing mice model. RT-qPCR, ELISA analysis, and flow cytometry were used to investigate the in vitro antitumor mechanisms of C-H/D/M. Results: The diameter and PDI of the C-H/D/M were 173.57 +/- 1.30 nm and 0.027 +/- 0.004, respectively. C-H/D/M promoted and maintained the sustained release and the uptake of DOX significantly. After transfection, the MDR1 mRNA and P-gp expression levels were down-regulated by 44.31 +/- 3.6% (P < 0.01) and 38.08 +/- 2.4% (P < 0.01) in an MCF-7/ADR cell line. The fluorescent images of the treated BALB/c nude mice revealed that C-H/D/M achieved targeted delivery of siMDR1 and DOX into the tumor tissue. The in vivo tumor inhibition results demonstrated that the tumor inhibition rate of the C-H/D/M treated group was 54.05% +/- 1.25%. The biosafety results indicated that C-H/D/M did not induce significant damages to the main organs in vivo. Conclusion: C-H/D/M can be used as an ideal non-viral tumor-targeting vector to overcome
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